不同年龄三倍体毛白杨纸浆林生长期间细根变化规律  

Fine root dynamics of different aged triploid Populus tomentosa pulp forests during growth period

作　　者：宋曰钦[1] 翟明普[2] 贾黎明[2] 李广德[2] 

机构地区：[1]黄山学院,安徽黄山245041 [2]北京林业大学森林培育与保护省部共建重点实验室,北京100083

出　　处：《生态学杂志》2010年第9期1696-1702,共7页Chinese Journal of Ecology

基　　金：国家"十一五"科技支撑项目(2008BAD95B07-01);黄山学院启动资助项目(2009xkjq003)

摘　　要：以3、5、6及7年生三倍体毛白杨纸浆林为对象,于2008年研究生长期(4—11月)细根生物量、根长密度和细根表面积的月动态变化和垂直分布的变化。结果表明:细根生物量、根长密度或细根表面积在4—11月均表现为单峰曲线,其中细根生物量的峰值出现在8月,而根长密度和细根表面积的峰值出现在9月;细根生物量、根长密度及细根表面积的平均值随年龄的增加而增加,3、5、6及7年生的三倍体毛白杨细根生物量分别为658.3、750.6、1048.1和1115.0kg.hm-2,相应地根长密度分别为12.490×103、9.983×103、9.227×103和5.921×103m.m-3,细根表面积分别为12.17、18.68、22.23和25.28m2.m-3;细根生物量、根长密度及细根表面积的垂直分布表现为表层化,随年龄的增加表层细根增多,其中细根生物量的46.36%～51.12%、根长密度的62.77%～75.33%、细根表面积的61.74%～64.16%均分布在0～10cm土层。Taking 3-,5-,6-,and 7-year-old triploid Populus tomentosa pulp forests as test objects,this paper studied the monthly dynamics and vertical distribution of their fine root biomass,root length density,and fine root surface area during the growth period April-November 2008. In the growth period,the dynamics of the fine root biomass,root length density,and fine root surface area all presented a unimodal curve,with the maximum of fine root biomass observed in August,and the maximum of root length density and fine root surface area observed in September. The mean values of the fine root biomass,root length density,and fine root surface area all increased with tree age,being 658.3,750.6,1048.1 and 1115.0 kg·hm-2,12.490×103,9.983×103,9.227×103 and 5.921×103 m·m-3,and 12.17,18.68,22.23 and 25.28 m2·m-3 for the 3-,5-,6-,and 7 years old stands,respectively. Surface soil had the greatest distribution of fine root biomass,root length density,and fine root surface area,and the fine roots in surface soil increased with tree age. 46.36%-51.12% of fine root biomass,62.77%-75.33% of root length density,and 61.74%-64.16% of fine root surface area were found in 0-10 cm soil layer.

关 键 词：三倍体毛白杨 细根生物量 根长密度 细根表面积 

分 类 号：S718.55[农业科学—林学]